使用New-Item和Add-Content创建PowerShell脚本文件遇问题求助

这是我首次在SO（及任何公开平台）发帖，若问题已被解答或格式不当，敬请谅解。我是PowerShell脚本编写新手，希望完成以下需求：编写脚本收集操作系统用户凭据、密码及远程服务器的IP/FQDN/主机名，生成供计划任务调用的ps1文件，实现每日将指定文件夹复制到远程服务器并覆盖目标文件夹。但在使用New-Item和Add-Content cmdlets添加代码行时遇到问题。

当前脚本 #

#Clear the Screen
Clear-Host

#Create Variable for OS User Account
$User = read-host "What is the OS User that has permissions to the remote web server?"

#Clear the Screen
Clear-Host

#Password for OS User Account
$Password = Read-Host "What is the password of the OS account that has permissions to the remote web server?"

#Clear the Screen
Clear-Host

#Convert Password String
$PWord = ConvertTo-SecureString -String $Password -AsPlainText -Force

#Combine User Name and Password into One Entity
$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $User, $PWord

#IP Address of Destination ICA Web Server
$DestServer = Read-Host "What is the IP address\FQDN\Hostname of the Destination Web Server"

#Create a PowerShell File that will be used for Task Scheduler
New-Item "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" -ItemType File -Force -Value "$PWord = ConvertTo-SecureString -String $Password -AsPlainText -Force"
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" ""
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $User, $PWord"
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" ""
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "$Session = New-PSSession -ComputerName $DestServer -Credential $Credential"
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "Copy-Item `"C:\Web\Web\Download`" -Destination `"C:\Web\Web\`" -ToSession $Session -Recurse -Force"

生成的异常文件内容 #

使用TestUser作为用户名、PW作为密码、10.10.10.10作为远程服务器时，生成的ps1文件内容如下：

System.Security.SecureString = ConvertTo-SecureString -String PW -AsPlainText -Force
System.Management.Automation.PSCredential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList TestUser, System.Security.SecureString

 = New-PSSession -ComputerName 10.10.10.10 -Credential System.Management.Automation.PSCredential
Copy-Item "C:\Web\Web\Download" -Destination "C:\Web\Web\" -ToSession  -Recurse -Force

问题详情 #

• 第一行显示System.Security.SecureString而非$PWord变量；
• 第二行显示System.Management.Automation.PSCredential和System.Security.SecureString而非$Credential和$PWord变量；
• 第三行未显示$Session变量，且Credential参数值为System.Management.Automation.PSCredential；
• 第四行未显示$Session变量。

似乎PowerShell不支持通过New-Item和Add-Content直接添加变量，恳请各位提供建议！

更新：修正后的可用脚本 #

感谢mklement0提供解决方案，以下是修正后的可用脚本：

#Clear the Screen
Clear-Host

#Create Variable for OS User Account
$User = read-host "What is the OS user account that has permissions to the remote web server?"

#Clear the Screen
Clear-Host

#Password for OS User Account
$Password = Read-Host "What is the password of the OS user account that has permissions to the remote web server?"

#Clear the Screen
Clear-Host

#Convert Password String
$PWord = ConvertTo-SecureString -String $Password -AsPlainText -Force

#Combine User Name and Password into One Entity
$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList $User, $PWord

#IP Address of Destination ICA Web Server
$DestServer = Read-Host "What is the IP address, FQDN, or Hostname of the remote web server"

#Create a PowerShell File that will be used for Task Scheduler
New-Item "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" -ItemType File -Force -Value "`$OSUser = `"$User`""
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" ""
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "`$PWord = ConvertTo-SecureString -String `"$Password`" -AsPlainText -Force"
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "`$Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList `$OSUser, `$PWord"
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" ""
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "`$Session = New-PSSession -ComputerName `"$DestServer`" -Credential `$Credential"
Add-Content "C:\Test\ScheduledTask\CopyPasteDownLoadFolder.ps1" "Copy-Item `"C:\Web\Web\Download`" -Destination `"C:\Web\Web\`" -ToSession `$Session -Recurse -Force"

内容的提问来源于stack exchange，提问作者SeveredTRUTH